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SF5920S

SF5920S is a high performance, cost efficiency，highly integrated DCM（Discontinuous Conduction Mode）Primary Side Regulation （PSR）controller for Offline LED lighting applications.
SF5920S uses Multi Mode Control to improve efficiency and reliability and to decrease audio noise energy @ light loadings. Around the full load, the system operates in PWM+PFM mode, which improve the system reliability. Under light load conditions, the IC operates in PFM mode to achieve excellent regulation and high efficiency, and to achieve less than 70mW standby power.
Sf5920S also integrates the function of " Max Frequency Clamping @ Output Short Circuit" to limits power MOSFET Vds spike when output short circuits occurs.
SF5920S has built-in proprietary NC-Cap/PSRTM control for CV control, which eliminates external compensation or filtering capacitor, It also has built-in cable drop compensation function, which can provide excellent CV performance. The IC also has built-in soft start function to soften the stress on the MOSFET during power on period.
SF5920S integrates functions and protections of Under Voltage Lockout (UVLO), VCC Over Voltage Protection (OVP), Cycle-by-cycle Current Limiting (OCP), All Pins Floating Protection, Over Load Protection (OLP), RT Pin Short-to-GND Protection, Gate Clamping, VCC Clamping, Leading Edge Blanking (LEB).
SF5920S is available in SOT23-5 packages.

SFL678

SFL678 is a high precision AC/DC offline PSR (Primary Side Regulation) controller for LED luminaries. The IC can provide very tight (less than 3%) constant current control (CC) ideal for LED lighting applications.
SFL678 uses Pulse Frequency Modulation (PFM) control to improve efficiency and eases system EMI design. The IC dramatically lower system cost by eliminating secondary feedback circuits.The wide VDD operating range (10V to 30V, typical) of SFL678 can ease flexible LED system design. The IC also has built-in soft start function to soften the stress on the MOFET during power on period.
SFL678 integrates functions and protections of Under Voltage Lockout (UVLO), VDD Over Voltage Protection (VDD OVP), LED Open/Short circuit protection,Soft start Control, cycle-by-cycle Current Limiting (OCP), pins Floating Protection, Gate Clamping, VDD Clamping.
SFL678 is available in SOT23-6 packages.

SF5938S

SF5938S is a high performance, highly integrated DCM (Discontinuous Conduction Mode) Primary Side Regulation (PSR) power switch for offline small power converter applications. It can achieve less than ±4% CV/CC precision.
SF5938S has built-in proprietary NC-Cap/PSR-IITM control for CV control, which eliminates external compensation or filtering capacitor. It has built-in cable drop compensation function, which can provide excellent CV performance. The IC uses Multi Mode Control to improve efficiency and reliability and to decrease audio noise energy @ light loadings. The IC can achieve less than 70mW standby power.
SF5938S integrates proprietary "Audio Noise Cancellation" control for audio noise free operation. The IC has built-in "Fast Dynamic Response" control to meet USB Charge requirements. SF5938S also integrates proprietary "Zero-Output Startup" control to achieve startup when output is near zero voltage. The IC has proprietary "Smart Output Short Protection", which can protect the system with large leakage inductance when output is short circuit.
SF5938S integrates functions and protections of FB Short Protection, Under Voltage Lockout (UVLO), VDD Over Voltage Protection (VDD OVP), Soft Start, Cycle-by-cycle Current Limiting (OCP), Pin Floating Protection, VDD Clamping.
SF5938S is available in DIP8 packages.